Bore axis leveling method

Abstract

The invention discloses a bore axis leveling method, and belongs to the technical field of measurement. According to the bore axis leveling method, the height of a horizontal visual axis of a theodolite telescope is adjusted, so that two mark points on the bore axis are located on the same horizontal visual axis, and then bore axis leveling is achieved. According to the method, after the muzzle and the theodolite are adjusted, a plurality of mark points are correspondingly arranged, and then the axis of the bore is leveled by adjusting the mark points. The method is not influenced by the caliber of the artillery body tube and the change of the inner diameter of the muzzle, and is suitable for various types of artillery.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement. Background Art

[0002] The theoretical axis of the gun bore is the line connecting the geometric center of the section at the beginning of the gun bore and the geometric center of the section at the muzzle. In many inspection items of artillery inspection, it is necessary to adjust the level of the gun bore axis. Generally, the gun barrel is roughly leveled by adjusting the horizontal platform of the gun barrel. Since there is usually an angle between the horizontal platform of the gun barrel and the axis of the gun bore, it is not suitable for precise leveling of the axis of the gun bore.

[0003] At present, the "muzzle plug method" is used for leveling the axis of the gun bore. This method is to insert a special muzzle plug into the muzzle, with the axis of the muzzle plug as the axis of the gun bore. The horizontal platform set on the muzzle plug is parallel to the axis of the muzzle plug. By adjusting the elevation angle of the gun barrel, the horizontal platform on the muzzle plug is made horizontal, thereby achieving horizontal adjustment of the axis of the gun bore. Since the muzzle plug is a special measuring tool, gun barrels of different calibers require muzzle plugs of different diameters. Even for the same gun barrel, as the number of shells fired increases, the inner diameter of the muzzle will change, resulting in the required diameter of the muzzle plug at different stages not being exactly the same. Especially when the muzzle is severely ablated, it is difficult to match a suitable muzzle plug. This results in the "muzzle plug method" being limited in the practical application of leveling the axis of the gun bore. Summary of the invention

[0004] The invention aims to realize a method for leveling the bore axis by adjusting the height of the horizontal visual axis of the theodolite telescope so that two marking points on the bore axis are on the same horizontal visual axis.

[0005] The steps of the present invention are: S3. Paste a crosshair on the muzzle end face, with the center of the crosshair being the mark point A of the bore axis at the muzzle; S4, open the firing pin hole at the breech, the center of the firing pin hole is the mark point B of the bore axis at the breech; S5. Set up the theodolite in front of the muzzle, adjust the theodolite tripod so that the theodolite three-axis center T is at the same height as the muzzle mark point A, and level the theodolite; S6. Measure the distance l between the theodolite three-axis center T and the gun trunnion center O OT ; S7. Adjust the theodolite and the gun so that the mark point B at the gun tail is on the horizontal line of the crosshairs of the theodolite telescope. At this time, the elevation angle of the theodolite is β B ; S8. Calculate the height difference h between the theodolite three-axis center T and the gun tail mark point B according to formula (1) B ; h B = lOT tanβ B (1) S9, if |h B |≥3mm, adjust the height of the theodolite by adjusting the height of the theodolite tripod. After leveling the theodolite, repeat S7 to S8 until |h B |<3mm; S10. Keep the theodolite level and adjust its height; S11. Aim the theodolite telescope at the breech mark point B when the visual axis is horizontal; S12. Keep the theodolite telescope's visual axis horizontal and turn the gun elevation mechanism so that the muzzle mark point A is on the horizontal line of the theodolite crosshairs; S13. Keep the gun still, keep the theodolite telescope's visual axis horizontal, adjust the theodolite telescope's focal length, and observe whether the gun breech mark point B is on the horizontal line of the theodolite crosshairs; S14. If the breech mark point B is not on the horizontal line of the theodolite crosshairs, repeat S10 to S12. S15. If the breech mark point B is on the horizontal line of the theodolite crosshairs, the bore axis is leveled.

[0006] The present invention keeps the theodolite level and adjusts its height: S101. Place the level tube parallel to the two foot screws; S102. Keep the bubble in the level tube centered and rotate the two screws in the same direction; S103. Rotate the aiming part 90° and use the third foot screw to level the level.

[0007] The invention is not affected by the caliber of the gun barrel, is not affected by the change of the inner diameter of the gun muzzle, and is applicable to various types of guns. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the site layout; Figure 2 It is a schematic diagram of keeping the theodolite level and adjusting its height. DETAILED DESCRIPTION

[0009] The steps of the present invention are: S1. The gun under test is driven into the designated testing area and the gun is leveled using the patented “gun rotation plane leveling method” (CN115717848 A).

[0010] S2. Use a level to adjust the level of the gun body.

[0011] S3. A crosshair is attached to the muzzle end face, with the center of the crosshair being the marking point A of the bore axis at the muzzle.

[0012] S4. Open the firing pin hole at the breech block. The center of the firing pin hole is the marking point B on the axis of the barrel at the breech block.

[0013] S5, such as Figure 1 As shown, set up the theodolite just in front of the muzzle, adjust the theodolite tripod so that the three-axis center T of the theodolite is roughly at the same height as the muzzle mark point A, and level the theodolite.

[0014] S6. Measure the distance l between the theodolite three-axis center T and the gun trunnion center O OT .

[0015] S7. Adjust the theodolite and the gun so that the mark point B at the gun tail is on the horizontal line of the crosshairs of the theodolite telescope. At this time, the elevation angle of the theodolite is β B .

[0016] S8. Calculate the height difference h between the theodolite three-axis center T and the gun tail mark point B according to formula (1) B . h B = l OT tanβ B (1)

[0017] S9, if |h B |≥3mm, adjust the height of the theodolite by adjusting the height of the theodolite tripod. After leveling the theodolite, repeat S7 to S8 until |h B |<3mm.

[0018] S10, such as Figure 2 Keep the theodolite level and adjust its height as shown.

[0019] S11. Aim the theodolite telescope at the breech mark point B when the visual axis is horizontal.

[0020] S12. Keep the theodolite telescope's visual axis horizontal and turn the gun elevation mechanism so that the muzzle mark point A is on the horizontal line of the theodolite crosshairs.

[0021] S13. Keep the gun still, keep the theodolite telescope's visual axis horizontal, adjust the theodolite telescope's focal length, and observe whether the gun breech mark point B is on the horizontal line of the theodolite crosshairs.

[0022] S14. If the breech mark point B is not on the horizontal line of the theodolite crosshairs, repeat S10 to S12.

[0023] S15. If the breech mark point B is on the horizontal line of the theodolite crosshairs, the bore axis is leveled.

[0024] In step S10, keeping the theodolite level and adjusting its height is achieved by the following steps: S101. Place the spirit level parallel to the two screw feet.

[0025] S102. Keep the bubble in the spirit level centered and turn the two screws in the same direction.

[0026] S103. Rotate the aiming part 90° and use the third foot screw to level the level.

[0027] Examples: Basic conditions: The distance l between the theodolite three-axis center T and the gun trunnion center O OT =10000mm; standard deviation of the coincidence of the observation point of the theodolite and the horizontal line of the telescope crosshairs σ J =0.2mm; l OT The measurement standard deviation σ lOT =2mm; longitude and latitude pitch angle β B The measurement standard deviation σ βB =2″.

[0028] After 100,000 random samplings, the standard deviation of the angle between the bore axis and the horizontal plane was found to be 22.7″.

Claims

1. A method for leveling a gun bore axis, characterized in that: The steps are: S3. Paste a crosshair on the muzzle end face, with the center of the crosshair being the mark point A of the bore axis at the muzzle; S4, open the firing pin hole at the breech, the center of the firing pin hole is the mark point B of the bore axis at the breech; S5. Set up the theodolite in front of the muzzle, adjust the theodolite tripod so that the theodolite three-axis center T is at the same height as the muzzle mark point A, and level the theodolite; S6. Measure the distance l between the theodolite three-axis center T and the gun trunnion center O OT ; S7. Adjust the theodolite and the gun so that the mark point B at the gun tail is on the horizontal line of the crosshairs of the theodolite telescope. At this time, the elevation angle of the theodolite is β B ; S8. Calculate the height difference h between the theodolite three-axis center T and the gun tail mark point B according to formula (1) B ; h B =l OT tanβ B (1) S9, if |h B |≥3mm, adjust the height of the theodolite by adjusting the height of the theodolite tripod. After leveling the theodolite, repeat S7 to S8 until |h B |<3mm; S10. Keep the theodolite level and adjust its height; S11. Aim the theodolite telescope at the breech mark point B when the visual axis is horizontal; S12. Keep the theodolite telescope's visual axis horizontal and turn the gun elevation mechanism so that the muzzle mark point A is on the horizontal line of the theodolite crosshairs; S13. Keep the gun still, keep the theodolite telescope's visual axis horizontal, adjust the theodolite telescope's focal length, and observe whether the gun breech mark point B is on the horizontal line of the theodolite crosshairs; S14. If the breech mark point B is not on the horizontal line of the theodolite crosshairs, repeat S10 to S12. S15. If the breech mark point B is on the horizontal line of the theodolite crosshairs, the bore axis is leveled.

2. The method for leveling the bore axis according to claim 1, characterized in that: Keep the theodolite level and adjust its height: S101. Place the level tube parallel to the two foot screws; S102. Keep the bubble in the level tube centered and rotate the two screws in the same direction; S103. Rotate the aiming part 90° and use the third foot screw to level the level.

Images